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How do i do this and what is it called?​

How do i do this and what is it called?​-example-1
User Soomin
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2 Answers

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don't you have a text book with examples in it?

User Dwhalen
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The answer will be Cosx =1/2 and -1
How do i do this and what is it called?​-example-1
User Simon Mayrshofer
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